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Adding and updating dial plan rules
Cisco TelePresence ISDN Gateway 2.1 Online help (Printable format) 28 of 135
outgoing call to that of the incoming call. This means that if the encryption state
changes on either the incoming or outgoing call, the ISDN Gateway will attempt
to change the encryption state on the other side of the call. This can be helpful if
a call starts as an encrypted call both sides of the ISDN Gateway and then the
incoming call stops being encrypted for some reason; the outgoing part of the call
will also drop the encryption and both callers will know that the call is no longer
encrypted.
Select Required in the appropriate checkbox(es) if you always want the IP and/or
ISDN part of a call to be encrypted or Optional if encryption is only to be used to
endpoints that support it. Note that:
Encryption must also be enabled globally in the Settings > Encryption
page.
If Required is selected and the endpoint does not support encryption, the
call will be disconnected. If the endpoint does support encryption, no
media is passed until encryption can be ensured. However if you select
Optional and the endpoint supports encryption, then a call to may start
even before encryption can be guaranteed but will use encryption as
soon as possible
If the Call type is Telephone, then ISDN encryption is Disabled
These settings for IP and ISDN encryption are not available if you have
selected to use transparent encryption for this dial plan rule
o Place call on: (IP to ISDN only) optionally, select the ISDN port(s) on which the call may
be placed. The selected ports will be used in ascending or descending order as specified
in the Port search order field in the Settings > ISDN page.
o Receive call on: (ISDN to IP only) select the port(s) to advertise to the calling endpoint.
These ports may be used to complete subsequent calls from the calling end. The
selected ports will be used in ascending or descending order as specified in the Port
search order field in the Settings > ISDN page.
7. For Codecs allowed select an option from the drop-down list: <use default choices>, Custom
codec choices or Safe codec choices. The last two options are provided for older endpoints that
you cannot connect to when some codecs are enabled (even if the endpoint supports those
codecs). We recommend that you only use these options when you experience a problem.
o When you select Custom codec choices, the screen refreshes and you can select the
audio, video and H.239 video codecs that are allowed with this dial plan
o Safe codec choices only allows G711 and H261
8. Click Add rule.